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I thought i might have cross wired the sensors that are in position on the machine, so i used two spare sensors and tried a direct connection to the board with the same results.
I will get some new sensors from a reputable supplier.

I thought i might have cross wired the sensors that are in position on the machine, so i used two spare sensors and tried a direct connection to the board with the same results.
I will get some new sensors from a reputable supplier.

Did you try the spare ones individual.? Or both wired parallel.

Have you got a spare power source and say a relay or lamp so you can test them off the machine before fitting.

No, i connected one spare then both, not individually.
Thanks i will do that tomorrow.

First confirm both switches work. Then it's just down to wiring and because Mach's seeing the switch when individual that confirms the PMDX is working and you have the correct settings.
If both switches work then it can only really be down to how you have them wired.

I think you tried some which were mounted and some that were just lying on the bench.
If mounted than some don't like being flush with the surrounding metal, they need to protrude a bit. Are you sure one of them is not being activated.

Thanks for the feedback guys.
This is now slightly beyond my electronics diagnostic skills :-). Today i laid them on wood, connected them directly to the board individually and they worked as they should in mach.
If i join two together brown/brown blue/blue black/black and connect to the board it trips in mach?
I will order a different brand this evening and see how i get on.